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dcd_msp430x5xx: Improve EP0 IN handling (reuse short_packet field).

This commit is contained in:
William D. Jones 2019-09-28 01:51:05 -04:00
parent 030560792d
commit 63c94ff684
1 changed files with 10 additions and 8 deletions
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18
src/portable/ti/msp430x5xx/dcd_msp430x5xx.c
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@ -50,7 +50,6 @@ typedef struct {
uint16_t queued_len;
uint16_t max_size;
bool short_packet;
bool zlp_sent;
} xfer_ctl_t;
xfer_ctl_t xfer_status[8][2];
@ -203,8 +202,6 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
return false;
}
static volatile uint8_t iepcnt = 0xFF;
bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)
{
(void) rhport;
@ -217,7 +214,6 @@ bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
xfer->total_len = total_bytes;
xfer->queued_len = 0;
xfer->short_packet = false;
xfer->zlp_sent = false;
if(epnum == 0)
{
@ -266,21 +262,27 @@ static void transmit_packet(uint8_t ep_num)
if(ep_num == 0)
{
bool zlp = (xfer->total_len == 0);
if((!zlp && (xfer->total_len == xfer->queued_len)) || xfer->zlp_sent)
// First, determine whether we should even send a packet or finish
// up the xfer.
bool zlp = (xfer->total_len == 0); // By necessity, xfer->total_len will
// equal xfer->queued_len for ZLPs.
// Of course a ZLP is a short packet.
if((!zlp && (xfer->total_len == xfer->queued_len)) || xfer->short_packet)
{
dcd_event_xfer_complete(0, ep_num, xfer->queued_len, XFER_RESULT_SUCCESS, true);
return;
}
// Then actually commit to transmit a packet.
uint8_t * base = (xfer->buffer + xfer->queued_len);
uint16_t remaining = xfer->total_len - xfer->queued_len;
uint8_t xfer_size = (xfer->max_size < xfer->total_len) ? xfer->max_size : remaining;
xfer->queued_len += xfer_size;
if(xfer->total_len == 0)
if(xfer_size < xfer->max_size)
{
xfer->zlp_sent = true;
// Next "xfer complete interrupt", the transfer will end.
xfer->short_packet = true;
}
volatile uint8_t * ep0in_buf = &USBIEP0BUF;